Include GL in linked libraries for Linux Mint. Fix HEADLESS and segfault in header

Co-authored-by: sigonasr2 <sigonasr2@gmail.com>

main.cpp

@@ -60,28 +60,6 @@ struct Data{
 
 int main()
 {	
-	std::vector<int> testList;
-	std::cout<<"Test"<<std::endl;
-		testList.push_back(1);
-		testList.push_back(1);
-		testList.push_back(1);
-		testList.push_back(1);
-		testList.erase(testList.begin());
-		std::cout<<testList.size()<<std::endl;
-		testList.erase(testList.begin());
-		std::cout<<testList.size()<<std::endl;
-		testList.erase(testList.begin());
-		std::cout<<testList.size()<<std::endl;
-		testList.erase(testList.begin());
-		std::cout<<testList.size()<<std::endl;
-		testList.erase(testList.begin());
-		std::cout<<testList.size()<<std::endl;
-		testList.erase(testList.begin());
-		std::cout<<testList.size()<<std::endl;
-		testList.erase(testList.begin());
-		std::cout<<testList.size()<<std::endl;
-		testList.erase(testList.begin());
-		std::cout<<testList.size()<<std::endl;
 	Example demo;
 	if (demo.Construct(640, 480, 4, 4))
 		demo.Start();

pixelGameEngine.cpp

@@ -1,3 +1,2 @@
 #define OLC_PGE_APPLICATION
-#define OLC_PGE_HEADLESS
 #include "pixelGameEngine.h"

sig

@@ -3,7 +3,7 @@ export AUTO_UPDATE=true
 source utils/define.sh
 
 define PROJECT_NAME "C++ProjectTemplate"
-define CUSTOM_PARAMS "-std=c++17 -lX11 -lpthread -lpng -lstdc++fs -I/usr/include/lua5.3"
+define CUSTOM_PARAMS "-std=c++17 -lX11 -lGL -lpthread -lpng -lstdc++fs -I/usr/include/lua5.3"
 define LANGUAGE "C++"
 
 source utils/main.sh